I am repairing a section of exterior siding, trying to match a ship lap siding that I have not been able locate. I can get a pretty good match with 6″(nominal) bevel siding. The problem is with the 6″ bevel I only get 1/2 ” overlap to match the 5″ exposed face on the existing siding. From what I read bevel siding should overlap 1″. Is it a problem if the overlap is only 1/2″? The alternative is to go the 8″ bevel and get a whole lot of overlap.
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Rather than trying to stretch the 6", a pass through the tablesaw will make the 8" into the width you need.
Ripping the siding down gets the right dimensions but also creates a lot of waste. Will 1/2 overlap allow moisture to penetrate?
The smaller the lap the more likely wind blown moisture will get behind the siding. That's why there is a secondary barrier.Also with siding you have to take in the shrinkage factor. It's usually not much but sometimes it's enough to do away with a minimal lap. One board goes up, the other down and there you have it.It's up to you to determine if the waste factor is significant. If it's a whole house it might be, but for just a few boards I'd be breaking out the tablesaw.
On a sunny south exposure you could easily end up with no overlap in a couple of years.